我想写字符串/字符数据作为文件中的字节。我希望这种转换发生在IO。*类内部。我不想在字符串上使用getBytes()方法。文件写入:字符串到字节
我试过以下两个程序,但都是将数据写入字符。当我在记事本中打开文件时,我可以阅读这些字符。我如何将数据存储为字节?
import IO.FileWrite;
import java.io.*;
public class CharToChar {
private final String data;
public CharToChar(String data){
this.data = data;
}
public static void main(String[] args) throws IOException {
final CharToChar charToChar = new CharToChar("I am Manish");
charToChar.write();
}
private void write() throws IOException {
final File file = new File("CharToChar.txt");
final FileWriter fileWriter = new FileWriter(file);
final BufferedWriter bufferdWriter = new BufferedWriter(fileWriter);
bufferdWriter.write(this.data);
bufferdWriter.close();
}
}
import java.io.DataOutputStream;
import java.io.FileOutputStream;
import java.io.IOException;
public class WriteStringAsBytesToFile {
public static void main(String[] args) {
String strFilePath = "WriteStringAsBytes.txt";
try
{
//create FileOutputStream object
FileOutputStream fos = new FileOutputStream(strFilePath);
/*
* To create DataOutputStream object from FileOutputStream use,
* DataOutputStream(OutputStream os) constructor.
*
*/
DataOutputStream dos = new DataOutputStream(fos);
String str = "This string will be written to file as sequence of bytes!";
/*
* To write a string as a sequence of bytes to a file, use
* void writeBytes(String str) method of Java DataOutputStream class.
*
* This method writes string as a sequence of bytes to underlying output
* stream (Each character's high eight bits are discarded first).
*/
dos.writeBytes(str);
/*
* To close DataOutputStream use,
* void close() method.
*
*/
dos.close();
}
catch (IOException e)
{
System.out.println("IOException : " + e);
}
}
}
说明 - > Java文档说 OutputStreamWriter OutputStreamWriter是字符的桥梁流到字节流: *向其写入的字符编码成使用指定的字节。
OutputStreamWriter和InputStreamReader有什么用?我读这些类用作字符转换为字节的适配器 – HakunaMatata
OutputStreamWriter用于使用特定的字符编码将字符写入流中。相同的InputStreamReader,但阅读... ObjectOutputStream(我上面使用)不关心编码,请参阅http://docs.oracle.com/javase/1.4.2/docs/api/java/io/DataOutput .html#writeByte(int)如何将字符转换为字节。您只需使用DataInput的子类读回使用DataOutput编写的字符。 – Renato